CN107300523B - Road surface dynamic-static friction coefficient measuring device under indoor and outdoor multi-environment state - Google Patents
Road surface dynamic-static friction coefficient measuring device under indoor and outdoor multi-environment state Download PDFInfo
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- CN107300523B CN107300523B CN201710497291.3A CN201710497291A CN107300523B CN 107300523 B CN107300523 B CN 107300523B CN 201710497291 A CN201710497291 A CN 201710497291A CN 107300523 B CN107300523 B CN 107300523B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention discloses a road surface dynamic-static friction coefficient measuring device in indoor and outdoor multi-environment states, which comprises a test box and a friction coefficient measuring device, wherein the friction coefficient measuring device is arranged in the test box, the test box comprises a box body with an opening at the bottom and a bottom plate, the vertical surfaces at two sides of the width direction of the box body are made of transparent materials, the friction coefficient measuring device comprises a variable frequency motor, a strain type dynamometer, a sliding block and a test plane, the lower end face of the sliding block is provided with a rubber material, the sliding block is connected with one end of the strain type dynamometer through a hook, and the variable frequency motor is connected with the other end of the strain type dynamometer through an elastic connecting rope. The invention can be used for indoor measurement of the friction coefficient of a simulated road surface relative to a tire of a road surface test bed, can be convenient for measurement on an actual road surface, realizes measurement of dynamic-static friction coefficient under multiple environments, and is more convenient to carry when the measuring device is arranged in the box body.
Description
Technical Field
The invention relates to a road surface dynamic-static friction coefficient measuring device in indoor and outdoor multi-environment states.
Background
The anti-skid performance of the road surface is an important content showing the road safety quality, and the friction coefficient between the tire and the road surface is the most important index for representing the anti-skid performance. The stable road friction coefficient can provide good safety reserve for fast driving, so that the possibility of traffic accidents is reduced, and therefore, accurate detection and evaluation of the road friction coefficient are very important.
The current method for testing the friction coefficient of the road surface still mainly uses a traditional friction coefficient tester, and has the following defects: (1) The traditional measuring method can only measure the friction coefficient under one speed in a fixed-point static condition, and has low sampling frequency, low precision and poor representativeness. (2) The traditional testing method is carried out point by point, has long time consumption, high strength and low efficiency, and is not beneficial to quickly and comprehensively obtaining road condition information in road surface acceptance or large-scale detection. (3) In the test operation using the pendulum friction coefficient tester, the whole device can vibrate due to the fact that the pendulum falls instantly and must be caught by hands, the reading accuracy is greatly affected by operators, and the defects of difficulty in pressure calibration, poor reproducibility of test results and the like are also caused.
Disclosure of Invention
The invention aims to solve the technical problems that: the device for measuring the dynamic-static friction coefficient of the road surface in the indoor and outdoor multi-environment states is convenient to carry, and is convenient to measure the sliding friction coefficient and the static friction coefficient of the road surface indoors or outdoors.
In order to solve the problems, the invention comprises a test box and a friction coefficient measuring device, wherein the friction coefficient measuring device is arranged in the test box, the test box comprises a box body with an opening at the bottom and a bottom plate, the vertical surfaces at two sides in the width direction of the box body are made of transparent materials, the friction coefficient measuring device comprises a variable frequency motor, a strain type dynamometer, a sliding block and a test plane, a rubber material is arranged on the lower end face of the sliding block, the variable frequency motor is fixed at one side of the bottom end of the box body, the lower end face of the sliding block is arranged on the test plane, the sliding block is positioned at one side far away from the variable frequency motor, the sliding block is connected with one end of the strain type dynamometer through a hook, the variable frequency motor is connected with the other end of the strain type dynamometer through an elastic connection rope, when the elastic connection rope is stretched, the elastic connection rope and the hook are positioned on the same straight line and are parallel to the plane where the test plane is located, the test plane comprises a pavement test table and an actual pavement, when the test plane is the pavement test table, the bottom plate is the bottom surface of the test box is closed, the bottom plate is positioned on the pavement table, the actual pavement table is blocked, and the sliding table is arranged on the pavement table, and the bottom plate is not placed on the pavement table.
In order to facilitate the switching of the test plane, the invention further comprises a test plane replacing device, wherein a notch is arranged at the bottom of the vertical surface of the test box, which is far away from the variable frequency motor, and the bottom plate is arranged at the bottom of the test box in a sliding way along the length direction; the test plane replacing device comprises a slide block fixing clamp, the slide block fixing clamp comprises a U-shaped clamp opening and a handle, clamping grooves along the width direction of the opposite sides of the slide block are formed in the upper and lower opposite sides of the slide block, two clamping jaws of the U-shaped clamp opening are respectively and slidably arranged in the two clamping grooves, the outer side surfaces of the two clamping jaws of the U-shaped clamp opening do not protrude out of the plane where the corresponding opposite sides are located, an internal tooth gear ring and a moving block are sequentially arranged between the U-shaped clamp opening and the handle, the internal tooth gear ring is positioned on one side, close to the U-shaped clamp opening, of the moving block, fixedly connected with the internal tooth gear ring, in a rotating manner, of the moving block, one end, in a sliding manner, of the moving block is in an up-down direction, the other end, penetrating through a notch, of the handle is exposed out of the test box, the inner side of the handle is a cavity, the other end of the handle is respectively provided with a first driving wheel and a second driving wheel, the first driving wheel and the second driving wheel are respectively rotatably connected with the plane of the handle, the first driving wheel is fixedly connected with the first end, which is in a parallel to the first end, of the first end, which is fixedly connected with a connecting rod, the first end of the first driving wheel is fixedly meshed with the second driving wheel, the first end is fixedly connected with the first end, and the second end of the connecting rod is fixedly connected with the first end through the corresponding connecting rod, and the first end, and the connecting rod is in parallel to the first end, one end of the second connecting rod, which is far away from the second driving wheel, passes through the moving block and is positioned in the internal tooth gear ring and is fixedly connected with the second gear, when the rotation center line of the internal tooth gear ring is higher than the center line of the handle by a certain distance, the second gear is meshed with the internal tooth gear ring, and the length of the sliding block is equal to the height of the sliding block plus the height of the pavement test bed and the thickness of the bottom plate.
In order to avoid deflection of the handle, a guide ring is further arranged on the inner side of the vertical face where the notch is located, the guide ring is fixedly connected to the test box through a fixing rod, and the guide ring is sleeved on the handle.
In order to facilitate resetting and avoid the situation that the U-shaped clamping opening generates acting force on the sliding block, scales are arranged on the first driving wheel and the second driving wheel, scale marks are arranged in the middles of the notch of the first driving wheel and the notch of the second driving wheel, when the plane of the U-shaped clamping opening is parallel to the vertical direction, the scale mark of the second driving wheel indicates the position of a zero scale mark of the second driving wheel, and when the central line of the U-shaped clamping opening is collinear with the central axis of the handle, the scale mark of the first driving wheel indicates the position of the zero scale mark of the first driving wheel.
In order to facilitate the sliding block close to the variable frequency motor to pull back and reset, one end of the handle positioned outside the test box is rotatably provided with a rocking wheel, the rocking wheel is provided with a connecting wire, and the connecting wire passes through the cavity of the handle and the U-shaped clamping opening to be connected with the sliding block.
In order to the upside of box be provided with the handle, left half box and right half box in width direction of box, left half box and right half box lock joint become whole box.
The beneficial effects of the invention are as follows: according to the invention, the sliding block is arranged on the test plane, the rubber material is arranged on the bottom surface of the sliding block, which is in contact with the test plane, so as to simulate the material of a tire, the strain type dynamometer is arranged between the sliding block and the variable frequency motor, so that the friction force between the sliding block and the test plane when the sliding block is pulled can be tested, then the friction coefficient is reversely deduced and calculated through a friction force calculation formula, and the variable frequency motor and the strain type dynamometer are connected through the elastic connecting rope, so that the static friction force can be tested more accurately, the situation that the sliding moment from static to dynamic is too short when a rigid rope is used is avoided, and the degree of the sliding block on the strain type dynamometer can not be read when the sliding block is changed is avoided. The invention can be used for indoor measurement of the friction coefficient of a simulated road surface relative to a tire of a road surface test bed, can be convenient for measurement on an actual road surface, realizes measurement of dynamic-static friction coefficient under multiple environments, and is more convenient to carry when the measuring device is arranged in the box body.
Drawings
FIG. 1 is a schematic view of the structure of the pavement test stand according to the present invention;
FIG. 2 is a schematic side view of the pavement test stand of the present invention;
FIG. 3 is a schematic view of the structure of the present invention when testing an actual road surface;
FIG. 4 is a schematic illustration of the connection of the slider retaining clip to the slider of the present invention;
FIG. 5 is a schematic view of the interior of the handle of the slider clip.
Wherein: 1. the device comprises a box body, 2, a variable frequency motor, 3, an elastic connection rope, 4, a pavement test bench, 5, a bottom plate, 6, a strain dynamometer, 7, a sliding block, 8, a sliding block fixing clamp, 9, a guide ring, 10, a connecting wire, 11, a handle, 12, a rocking wheel, 13, a notch, 71, a rubber material, 81, a U-shaped clamping opening, 82, an internal tooth gear ring, 83, a moving block, 84, a handle, 821, a second gear, 822, a second connecting rod, 823, a second driving wheel, 831, a rack, 832, a worm, 833, a first gear, 834, a first connecting rod, 835 and a first driving wheel.
Detailed Description
The road surface dynamic-static friction coefficient measuring device in the indoor and outdoor multi-environment state as shown in figures 1 and 2 comprises a test box 1 and a friction coefficient measuring device, wherein the friction coefficient measuring device is arranged in the test box, the test box comprises a box body 1 with an opening at the bottom and a bottom plate 5, the two lateral vertical surfaces of the box body 1 are made of transparent materials, the transparent box body 1 is convenient for observing the reading of a strain type dynamometer 6, a lifting handle 11 is arranged on the upper side of the box body 1, the left half box body and the right half box body of the box body 1 are fastened in the width direction to form the whole box body 1, the friction coefficient measuring device comprises a variable frequency motor 2, the strain type dynamometer 6, a sliding block 7 and a test plane, a rubber material 71 is arranged on the lower end surface of the sliding block 7 and used for simulating tire materials, the variable frequency motor 2 is fixed on one side of the bottom end of the box body 1, the lower end face of the sliding block 7 is placed on a test plane, the sliding block 7 is located on one side of the test plane far away from the variable frequency motor 2, the sliding block 7 is connected with one end of the strain type dynamometer 6 through a hook, the variable frequency motor 2 is connected with the other end of the strain type dynamometer 6 through an elastic connection rope 3, the elastic connection rope 3 can avoid the situation that the pulling moment is too short when the static friction force is tested when the rigid rope is used, and the data is difficult to read, when the elastic connection rope is tightened, the elastic connection rope 3 and the hook are located on the same straight line and are parallel to the plane where the test plane is located, the test plane comprises a pavement test bed 4 and an actual pavement, when the test plane is the pavement test bed 4, the bottom plate 5 seals the bottom face of the test box 1, the road surface test bed 4 is fixedly arranged on the bottom plate, and when the test plane is an actual road surface, the bottom plate 5 does not prevent the sliding block 7 from being placed on the actual road surface in a sliding manner.
The embodiment further comprises a test plane replacing device, wherein a notch 13 is formed in the bottom of the vertical face of the test box 1, which is far away from the variable frequency motor 2, the bottom plate 5 is arranged at the bottom of the test box 1 in a sliding manner along the length direction, when the bottom plate 5 slides in the direction, which is far away from the variable frequency motor 2, the bottom plate 5 is in a state of leaking out of the test box 1 through the notch 13, and the upper edge of the notch 13 is higher than the test plane; the test plane replacing device comprises a slide block fixing clamp 8, the slide block fixing clamp 8 comprises a U-shaped clamp 81 and a handle 84, clamping grooves along the width direction of the opposite faces are formed in the upper and lower opposite faces of the slide block 7, two clamping jaws of the U-shaped clamp 81 are respectively arranged in the two clamping grooves in a sliding mode, the outer side faces of the two clamping jaws of the U-shaped clamp 81 do not protrude out of the plane where the corresponding opposite faces are located, an internal tooth gear ring 82 and a moving block 83 are sequentially arranged between the U-shaped clamp 81 and the handle 84, the internal tooth gear ring 82 is located on one side, close to the U-shaped clamp 81, of the moving block 83, the U-shaped clamp 81 is fixedly connected with the internal tooth gear ring 82, the internal tooth gear ring 82 is rotationally connected with the moving block 83, and the rotation center of the internal tooth gear ring 82 and the moving block 83 is the central axis of the internal tooth gear ring 82, the movable block 83 is slidably connected with one end of the handle 84, the movable block 83 and the handle 84 can be slidably connected through a sliding rail or a sliding groove, the sliding direction of the movable block 83 and the handle 84 is the up-down direction, the other end of the handle 84 passes through the vertical face where the notch 13 is positioned to be exposed out of the test box 1, the guide ring 9 is also arranged on the inner side of the vertical face where the notch 13 is positioned, the guide ring 9 is fixedly connected on the test box 1 through a fixed rod, the guide ring 9 is sleeved on the handle 84, the guide ring 9 strengthens the stability of the handle 84, the handle 84 is prevented from being skewed, the handle 84 is internally provided with a cavity, the other end of the handle 84 is respectively provided with a first driving wheel 835 and a second driving wheel 823, the first driving wheel 835 and the second driving wheel 823 are both rotatably connected inside the handle 84, the pipe wall of the handle 84 is provided with two notches, the first driving 835 and the second driving wheel 823 expose the handle 84 through corresponding notches respectively, the center of the first driving wheel 835 is fixedly connected with a first connecting rod 834, one end of the first connecting rod 834, which is far away from the first driving wheel 835, is fixedly connected with a worm 832, the worm 832 is in meshed connection with a first gear 833, the moving block 83 is fixedly provided with a rack 831, the rack 831 is in meshed connection with the first gear 833, the length direction of the rack 831 is parallel to the relative sliding direction of the moving block 83 and the handle 84, the center of the second driving wheel 823 is fixedly connected with a second connecting rod 822, one end of the second connecting rod 822, which is far away from the second driving wheel 823, passes through the moving block 83 and is located in the internal tooth 82 and is fixedly connected with a second gear 821, when the rotation center line of the internal tooth 82 is higher than the center line of the handle 84 by a certain distance, the second gear 821 is in meshed connection with the internal tooth 82, the length of the slide block 7 is equal to the height of the slide block 7 plus the height of the road surface test bed 4 and the thickness of the bottom plate 5, the length of the slide block 7 is guaranteed to be in the direction of the road surface test bed 7, the bottom surface 7 is just above the road surface 1, and the bottom surface 7 is in the actual direction of the road surface 1 after the test bed is in the test bed surface 1, and the bottom surface 1 is in the actual road surface 1 is in the test bed surface-down.
In this embodiment, the handle 84 is provided with the rocking wheel 12 by rotating the end outside the test chamber 1, the rocking wheel 12 is provided with the connecting wire 10, the connecting wire 10 passes through the cavity of the handle 84 and the U-shaped clamping opening 81 to be connected with the sliding block 7, when the test is performed, the variable frequency motor 2 pulls the sliding block 7 to the end close to the variable frequency motor 2, and the rocking wheel 12 is rotated to pull the sliding block 7 back through the connecting wire 10.
The first driving wheel 835 and the second driving wheel 823 in this embodiment may be provided with scales, and the middle of the notch of the first driving wheel 835 and the notch of the second driving wheel 823 are provided with scale marks, when the plane of the U-shaped clamping opening 81 is parallel to the vertical direction, the scale marks of the second driving wheel 823 indicate the positions of the zero scale marks of the second driving wheel 823, and when the center line of the U-shaped clamping opening 81 is collinear with the central axis of the handle 84, the scale marks of the first driving wheel 835 indicate the positions of the zero scale marks of the first driving wheel 835.
Working principle: during teaching or detection work, a test experiment is often required to be carried out on the friction coefficient of the pavement relative to the tire, an indoor test is required to be carried out on the material before pavement construction is carried out, whether the friction coefficient of the material relative to the tire meets the requirement or not is observed, and after the pavement is established, the actual friction coefficient value is also required to be detected by sampling the pavement. When the indoor pavement test stand 4 is subjected to test, the first driving wheel 835 is firstly regulated to drive the worm 832 to rotate through the first connecting rod 834, the worm 832 drives the first gear 833 to rotate, the first gear 833 drives the U-shaped clamping opening 81 to drive the sliding block 7 to ascend for a small distance to separate from the preset test stand through the rack 831, then the bottom plate 5 drives the preset test stand to be pulled out from the notch 13, the preset test stand is detached, the prepared pavement test stand 4 is fixed on the bottom plate 5, the bottom plate 5 is pushed back into the test box 1, the pavement test stand 4 is kept the same as the preset test stand in height during manufacturing, the first driving wheel 835 is reversely rotated to be returned to the zero scale mark position to ensure that the sliding block 7 is placed on the pavement test stand, the U-shaped clamping opening 81 has no acting force on the sliding block 7, then the variable frequency motor 2 is started, the variable frequency motor 2 pulls the variable type friction meter 6 through the elastic connecting rope 3, after the reading of the variable type friction meter 6 is continuously increased by a certain value, the sliding block 7 starts to slide after the preset test stand is increased, the value is recorded as static force, the sliding block 7 starts to slide, the sliding force tends to be the static force, the value is calculated as the static force, the dynamic coefficient is calculated as the friction coefficient, the dynamic coefficient is the dynamic coefficient, and the dynamic coefficient is the friction coefficient is stable, and the friction coefficient is calculated as the friction coefficient, and the friction coefficient is N, and the friction coefficient is calculated as the friction coefficient, and the friction coefficient is stable, and the friction coefficient is N. By varying the rotational speed of the variable frequency motor 2, the coefficient of friction of the slide 7 at the corresponding sliding speed is tested.
When the measuring device is brought to the field to carry out actual pavement measurement, the test box 1 is placed on a pavement to be tested, the first driving wheel 835 is rotated to a set angle, the U-shaped clamping opening 81 drives the slide block 7 to ascend and separate from a preset test bed, the second gear 821 is meshed with the internal tooth gear 82, the bottom plate 5 drives the preset test bed to be pulled out from the notch 13, the second driving wheel 823 is rotated, the second driving wheel 823 drives the U-shaped clamping opening 81 to rotate 90 degrees through the second gear 821 and the internal tooth gear 82, the sliding is correspondingly rotated for 90 degrees, rubber materials are attached to the new bottom surface of the rotated slide block 7, the U-shaped clamping opening 81 can be prevented from being lifted by a certain height in advance, the edge of the slide block 7 is prevented from being overturned due to interference of the pavement when the slide block 7 is driven to overturn, the first driving wheel 835 is reversed to a zero scale line position after the slide block is overturned by 90 degrees, the slide block 7 is attached to the actual pavement, the U-shaped clamping opening 81 has no acting force on the slide block 7, the variable frequency motor 2 is started, and the friction coefficient of the actual pavement relative to the tire is tested according to the test method. In carrying out the multi-place measurement to the road surface, need not to repeat above-mentioned step, directly promote test box 1 can, U-shaped clamp mouth card is in the spout of slider, carries out spacingly to slider 7 in vertical direction, avoids dropping out test box 1 after promoting test box 1, when placing test box 1 on the road surface again, the bottom surface of slider 7 is contacted with the road surface is complete again.
The measurement of the dynamic-static friction coefficient of this patent refers to the measurement of the static friction coefficient and the measurement of the sliding friction coefficient of the road surface with respect to the rubber material.
Claims (3)
1. The utility model provides a road surface dynamic-static friction coefficient survey device under indoor outer many environment conditions which characterized in that: the device comprises a test box and a friction coefficient measuring device, wherein the friction coefficient measuring device is arranged in the test box, the test box comprises a box body with an opening at the bottom and a bottom plate, transparent materials are adopted by vertical surfaces at two sides of the width direction of the box body, the friction coefficient measuring device comprises a variable frequency motor, a strain type dynamometer, a sliding block and a test plane, rubber materials are arranged on the lower end face of the sliding block, the variable frequency motor is fixed on one side of the bottom end of the box body, the lower end face of the sliding block is arranged on the test plane, the sliding block is positioned on one side far away from the variable frequency motor, the sliding block is connected with one end of the strain type dynamometer through a hook, the variable frequency motor is connected with the other end of the strain type dynamometer through an elastic connection rope, when the elastic connection rope is tensioned, the elastic connection rope and the hook are positioned on the same straight line and are parallel to a plane where the test plane is located, the test plane comprises a pavement test table and an actual pavement, when the test plane is the pavement test table, the bottom surface of the bottom plate seals the test box, the pavement table is fixedly arranged on the pavement table, the test plane is arranged on the bottom surface of the sliding block, and the pavement is not actually placed on the pavement; the test plane replacing device is characterized by further comprising a test plane replacing device, a notch is formed in the bottom of the vertical face, far away from the variable frequency motor, of the test box in the length direction, the bottom plate is arranged at the bottom of the test box in a sliding mode along the length direction, when the bottom plate slides in the direction, far away from the variable frequency motor, of the bottom plate, the bottom plate is in a state of penetrating through the notch to leak out of the test box, and the upper edge of the notch is higher than the test plane; the test plane replacing device comprises a slide block fixing clamp, the slide block fixing clamp comprises a U-shaped clamp opening and a handle, clamping grooves along the width direction of the opposite sides of the slide block are formed in the upper and lower opposite sides of the slide block, two clamping jaws of the U-shaped clamp opening are respectively and slidably arranged in the two clamping grooves, the outer side surfaces of the two clamping jaws of the U-shaped clamp opening do not protrude out of the plane where the corresponding opposite sides are located, an internal tooth gear ring and a moving block are sequentially arranged between the U-shaped clamp opening and the handle, the internal tooth gear ring is positioned on one side, close to the U-shaped clamp opening, of the moving block, fixedly connected with the internal tooth gear ring, in a rotating manner, of the moving block, one end, in a sliding manner, of the moving block is in an up-down direction, the other end, penetrating through a notch, of the handle is exposed out of the test box, the inner side of the handle is a cavity, the other end of the handle is respectively provided with a first driving wheel and a second driving wheel, the first driving wheel and the second driving wheel are respectively rotatably connected with the plane of the handle, the first driving wheel is fixedly connected with the first end, which is in a parallel to the first end, of the first end, which is fixedly connected with a connecting rod, the first end of the first driving wheel is fixedly meshed with the second driving wheel, the first end is fixedly connected with the first end, and the second end of the connecting rod is fixedly connected with the first end through the corresponding connecting rod, and the first end, and the connecting rod is in parallel to the first end, one end of the second connecting rod, which is far away from the second driving wheel, passes through the moving block and is positioned in the internal tooth gear ring, and is fixedly connected with a second gear; the inner side of the vertical face where the notch is positioned is also provided with a guide ring, the guide ring is fixedly connected to the test box through a fixing rod, and the guide ring is sleeved on the handle; the U-shaped clamping opening is characterized in that scales are arranged on the first driving wheel and the second driving wheel, scale marks are arranged in the middles of the notch of the first driving wheel and the notch of the second driving wheel, when the plane of the U-shaped clamping opening is parallel to the vertical direction, the scale marks of the second driving wheel indicate the positions of zero scale marks of the second driving wheel, and when the central line of the U-shaped clamping opening is collinear with the central axis of the handle, the scale marks of the first driving wheel indicate the positions of the zero scale marks of the first driving wheel.
2. The device for measuring the dynamic-static friction coefficient of a road surface in an indoor and outdoor multi-environment state according to claim 1, wherein: one end of the handle, which is positioned outside the test box, is rotationally provided with a shaking wheel, the shaking wheel is provided with a connecting wire, and the connecting wire penetrates through the cavity of the handle and the U-shaped clamping opening to be connected with the sliding block.
3. The road surface dynamic-static friction coefficient measuring device according to any one of claims 1-2, wherein: the upper side of box be provided with the handle, left half box and right half box on the width direction of box, left half box and right half box lock joint become whole box.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710497291.3A CN107300523B (en) | 2017-06-27 | 2017-06-27 | Road surface dynamic-static friction coefficient measuring device under indoor and outdoor multi-environment state |
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| CN201710497291.3A CN107300523B (en) | 2017-06-27 | 2017-06-27 | Road surface dynamic-static friction coefficient measuring device under indoor and outdoor multi-environment state |
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| CN107300523B true CN107300523B (en) | 2023-10-31 |
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| CN109630521B (en) * | 2019-01-30 | 2023-09-15 | 中南大学 | Resistor strain gauge pasting device |
| CN113109249B (en) * | 2021-04-16 | 2022-11-04 | 许青成 | Rainy day sole friction force detection equipment |
| CN115931704B (en) * | 2022-12-08 | 2023-09-15 | 中国建材检验认证集团江苏有限公司 | A test device for detecting municipal road surface coefficient of friction |
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